Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6470449 | Time-stamped tamper-proof data storage | — | 2002-10-22 |
| 6442691 | Authenticated time device | — | 2002-08-27 |
| 5347579 | Personal computer diary | — | 1994-09-13 |
| 5189700 | Devices to (1) supply authenticated time and (2) time stamp and authenticate digital documents | — | 1993-02-23 |
| 4936984 | Consumer water filtering apparatus | Mary Jane Blandford | 1990-06-26 |